I suspect it's no worse than Australian bull dust
I'm no geologist but I suspect Martian dust is made up of well rounded particles (like Australian bull dust) and not jagged or penetrative like asbestos fibers. Supposably lunar dust is bad news because it's all broken shards of silicate material (no wind blown erossion). The Martian surface is so darned old. Everything there including the dust has been around for hundreds of millions or billions of years.
Gary